【作者】 杨鹏；

【导师】 孙俊贻； 杨光情；

【作者基本信息】 重庆大学 ， 工程硕士（建筑与土木工程领域）（专业学位）， 2017， 硕士

【摘要】 地震是对人类危害很大的自然灾害之一,而我国地处全球最活跃的两大地震带上,地震给人民生命财产造成了极大的损失。诸多的震害经验告诉我们,通过工程抗震设防可以有效地减轻建筑物的损坏。因此,选择合适的抗震分析方法对结构进行抗震分析,并在此基础上进行结构和构件的抗震设计是非常必要的。而超限结构超出了设计规程规范的适用范围,对其进行抗震分析则显得尤为重要。本文以某211米超高层框架-核心筒结构为研究对象,考虑其高度超限及平面不规则等特点,研究其在地震作用下的动力响应规律和破坏机理,评估其抗震性能,本文完成如下几个方面的工作:(1)通过对地震作用分析方法和结构抗震设计方法的梳理,对比分析了目前工程界主要抗震设计方法的优缺点和适用范围;(2)采用ETABS和midas Building有限元程序建立了结构的弹性模型,对比分析两者在多遇地震作用下振型分解反应谱法的计算结果,验证结构体系布置的合理性;(3)在此基础上,采用ETABS程序进行弹性时程补充计算,得出3条地震波作用下结构的弹性响应,对比分析其结果与振型分解反应谱法计算所得数值的差异;(4)基于Perform-3D有限元程序建立结构的弹塑性分析模型,分析结构在罕遇地震激励下的结构非线性响应、构件损伤程度、构件及结构的耗能情况,进而评估整体结构的抗震性能。结果表明:(1)多遇地震作用下结构的各项弹性分析指标均在规程规范限值范围之内,验证了模型的有效性和结构体系的合理性;(2)罕遇地震作用下结构的整体侧向刚度较大,无薄弱层;连梁和框架梁最先进入非线性,塑性程度相对较深,而大部分剪力墙和框架柱处于弹性状态;构件的塑性耗能在总能量中的占比不是很高,地震能量主要通过阻尼耗能和应变能耗散;(3)以Perform-3D弹塑性时程计算结果为分析依据,基于我国抗震规范对其抗震性能进行评估,结构处于中等破坏~不严重破坏阶段,说明结构具有较好的抗震性能,满足抗震设防的要求;(4)Perform-3D在超高层结构动力弹塑性分析中具有较好的适用性。本文所用的抗震分析方法及相关参数的选取对超高层结构的抗震设计具有一定的借鉴意义。更多还原

【Abstract】 Earthquakes are one of the most dangerous natural disasters to human.China is located in the world’s two most active earthquake belt,so the earthquake caused great losses to people’s life and property.Many of the earthquake experiences tell us that through the construction of seismic fortification can effectively reduce the damage to the building.Therefore,it is necessary to select the appropriate seismic analytic method,and on this basis to design the seismic structure and components.The overrun structure is beyond the scope of the specification of the design procedure,so it is of great importance to carry out the seismic analysis.This paper focus on a 211-meter super-high-rise framecore tube structure.In view of its height exceed limit and irregular plane,the dynamic response rule and failure mechanism under earthquake are studied to evaluate its seismic behavior.This paper contains the following parts:(1)Through sorting out the seismic action analysis method and design method of structures,this paper did comparative analysis of the advantages and disadvantages of the main seismic design method and its application scope.(2)ETABS and midas Building finite element program are used to establish the elastic model of the structure.By comparing their results of mode-superposition response spectrum method under earthquake,so as to verify the rationality of the structural arrangement of the structure.(3)On this base,the ETABS program is used to calculate the elastic time-course,and the elastic responses under three seismic waves can be obtained.Comparing the differences of its results with the value of mode-superposition response spectrum method.(4)The elastic-plastic model of the structure is established based on the Perform-3D finite element program,and the nonlinear response of the structure,the damage degree of components,the energy consumption of components and structures under rare earthquakes is analyzed,and then evaluate the seismic performance of the whole structure.The results show that:(1)the elasticity of the structure under frequent seismic actions is within the limits of the specification,and the validity of the model and the rationality of the structural system are verified.(2)The overall lateral stiffness is big and there is no weak layer under rare earthquake;the coupling beam and the frame beam first enter the nonlinearity,the plasticity degree is relatively deep;while most of the shear wall and the frame column are in the elastic state;the plastic energy consumption of the component is not very high in the total energy,and the seismic energy is mainly dissipated by damping energy dissipation and strain energy.(3)According to the calculation results of Perform-3D elastic-plastic time-history and based on China’s seismic code,the structure is in moderate failure stage,which indicates that the structure has good seismic performance to meet the requirements of seismic fortification.(4)Perform-3D has good applicability in dynamic elastic-plastic analysis of super high-rise structures.The seismic analysis method and the related parameters used in this paper can provide reference for the seismic design of super high-rise structures.更多还原